Mounting arrangement for a high intensity light source



May 30, 1939. H. DE JONG ET AL 2,160,648

MOUNTING ARRANGEMENT FOR A HIGH INTENSITY LIGHT SOURCE Filed Feb. 5, 1958 F'agz.

Inventors: Hendrik cle Jorg, lJar# Bergman, Willem KorterwPa/g- His ttorneg.

Patented May 30, 1939 MOUNTING AHRANGEMENT Fon. A HIGH INTENSITY LIcH'i` sonnen Hendrik de Jong, Jan Bergmansgand Willem K ortenray, Eindhoven, Netherlands, assllnorl' to General Electric Company, a corporation of New York Application February 5, 1938,18erlal No. 189,006

Germany February 13. 1937 i Claims.

Our invention relates to a mounting arrangement for a high intensity light source, and more particularly to a liquid-cooled mounting therefor. The light projector, according to our iny reduced to such an extent that, particularly with searchlight and projector installations, the whole of the device comprising the tube, the reflector and the members for circulating the cooling medium have been reduced to much smaller dimensions than any heretofore known. With this concentrated and inherently advantageous construction of such devices there arose, however, great drawbacks as to the arrangement of the members for the supply and the discharge of the cooling liquid and of the electric current con- -ductors of the discharge tubes. According to the invention, the casing of the device contains a guide member for the cooling liquid which is formed in such manner that the members for the supply and the discharge of the cooling liquid are provided at the one end of the device and the current supply members of the tube at the other end thereof. The novel device according to the invention is .of very simple construction, the aperture provided in the reflector for the passage of radiations being closed by a transparent guide mem- 40, ber which is arranged and formed in such man-4 nerthat the cooling liquid flows along it on both sides but in opposite directions.

A suitable form of construction of the device is obtained when the supply member of the cooling liquid extends axially with respect to the tube and isv surrounded by a chamber provided with an outlet tube and communicating with the cooling chamber.

The electric supply conductors of the discharge tube are preferably arranged in such manner that the one supply conductor is connected to the reector so that the reflector and the casing form part of the circuit and preferably are 55 grounded, whereas the other supply conductor extends out of the device and is insulated from the casing.

It has been found to be particularly advantageous to construct the device in such manner thatthe tube, the guide member, the reiiector l and the electric supply conductors are united to form a unit which is arranged in the casing so as to be readily removable and replaceable therein. Also, the guide member is preferably arranged on the reflector in such manner as to be 10 readily removable and replaceable.

Where the device according to the invention is to be used only for the emission of visible rays it is advantageous to form the guide member of a material transparent to visible rays but which 16 will absorb the ultraviolet rays. But if, in such case, the radiation window or lens of the casing, instead of the aforesaid guide member, is made from a material transparent to light and retaining the ultraviolet rays, the ultraviolet rays n emitted by the discharge tube willl accordingly be absorbed solely by the window. These retained radiations are transformed into heat which may give rise to an excessive strain on the window, since the latter is cooled on one side 25 only. However, by also making the guide member which closes the radiation aperture of the reilector from a material which will retain the ultraviolet radiation, conditions are-lmaterially more favorable, because this member is' cooled 50 by the cooling liquid on both sides so that reduction of the heat absorbed by the window is obtained.

The invention will be understood more fully by reference to the ffollowing description and to the 35 accompanying drawing which represents, by way o'f example, one embodiment thereof.-

In the drawing, Fig. 1 is a longitudinal sectional view of a device according to our invention while Figs. 2 and 3 are cross-sections of the .m device taken on the lines 2-2 and 3-3 respectively of Fig. 1.

The illustrated high-pressure mercury-vapor discharge tube l consists of a cylindrical quartz tube which is narrowed at the ends and contains 4,-, two incandescent electrodes 2 and 3 which protrude during operation from the mercury by which they are surrounded. The said tube also contains a gas filling. The discharge tube l is mounted and arranged in the focal line of a likewise cylindrical reflector member consisting of a metal tube 5 which has secured to its inner wall a suitable reflecting coating or body 4 of suitable shape. A portion of the cylindrical wall of the metal tube 5 is cut away to provide a lon- 55 gitudinally extending opening parallel to the axis of the discharge tube 'I. This open side of the tube 5 is closed by a plate-.shaped guide or partition member 6 transparent to radiations and mounted between the tube '5 and the reflector coating l. 'Ihe guide member 6 consists in the preferred embodiment of glass transparent to visible rays and absorbing ultraviolet rays, said device is indicated by the arrows in Fig. 1.

glass having a composition similar to that of the glass utilized, for example, in incandescent lamp bulbs. The guide member 5 may be secured in place in the metal tube 5 by means of .a wire secured to the tube5, said wire not being shown in the drawing. At the end close to the electrode 2 the tube 5 is provided with a flange 8. At this end, the tube 5 contains an insulating body 9 slightly spaced from the 'end of the guide member 5 to thereby provide a slit l. The insulating body 5 has secured to it that end of the discharge tube I which contains the electrode 2, and is provided furthermore with a contact member Il which is electrically connected to the electrode 2. 'I'he current supply wire of the electrode 3.

is conductively connected to the metal` tube 5,

as shown at 23 in Fig. l.

The discharge tube I, the reilector 4 and the 'guide member 6, together with the metal tube 5 provided with the contact member I0, form a removable and replaceable unit. This unit is arranged in the cylindrical bore 24, which acts as a cooling chamber, of a casing Il', said unit being secured to the latter by means of a cap nut I2. At a suitable point with'respect to the a plurality of bores or openings Il therethrough.

'I'he wall I4 is also provided with a central bore 25 having a screw thread, said bore serving to accommodate a cooling water supply member I5 provided with a flange I5. The several bores I1 are preferably arranged concentrically about the said central bore 25. Between the flange I6 and the wall Il, andA co-axially surrounding the supply member I5, is a tube I8 which is provided with an outlet tube 22.

'I'he casing II is provided with screws I9 which may serve for mounting the device and which may also be utilized for establishing connections to the ground.

The contact member III fits into a contact bus 25 of a cable connecting piece 20. The latter is provided with a fastening or clamping device 2l which grips the screw cap I2. The cable 20 leads to the terminal of a source of current whichl generally consists of a transformer whose other terminal is grounded.

The path of the cooling water through the As appears from the drawing, the cooling water enters through the supply member I5 axially of the electrode end 3 of the discharge tube I and,

guided by the reflector I, metal tube 5, and the guide member 6, it flows around the discharge tube. 'I'he cooling water then .escapes through the slit 1 into the chamber 2l formed between the window I3 and the guide member 46, said chamber thus forming a liquid lens. The cooling water leaves this chamber 2l by flowing back along the guide member on the side remote from per 6 consequently renders it possible to provide the members for the supplyand the discharge of the cooling liquid at the one end of the device so that, completely separated therefrom, the live electric supply conductors may be provided at the other end of the device. Full advantage is taken, therefore, of the minimized dimensions of the whole device without any complications occurring in the operating conditions.

The particular discharge tube I illustrated has an internal diameter of 2 mm. The tube is operated with a specific load of 400 watts per centimeter and has an intrinsic brilliance of about 33,000 international candles per vsquare `centimeter. 'I'he specific luminous output amounts to about lumens per watt and the operating mercury vapor pressure to about 100 atmospheres.

The specific embodiment ofour invention described above fcrms a source of radiation only for visible light. However, all the rays emitted by the discharge tube may, of course, be'utilized in any desired manner. To that end, a material transparent to ultraviolet rays or a material having the desired transmitting capacity may be employed for the material of the guide member 5 and of the window I3.

What we claim as new and desire to secure by Letters Patent of the United States is:

1. A light projection device comprising a casing provided with a chamber having a window therein, a high intensity tubular lamp mounted in said chamber behind said window, a reflector member also mounted in said chamber behind said lamp, current-supply connections at one end of said device for supplying current to said lamp, inlet and outlet members at the other end of said device communicating with said chamber for circulating a cooling liquid therethrough, and guide means transparent to radiations from said lamp mounted in said chamber between said lamp and said window and arranged to control the flow of the cooling medium from said inlet member through said chamber past said lamp along one side of the guide means and back along the other side of the guide means to said outlet member. 4

2. A light projection device comprising a casing provided with achamber having a window therein, a high intensity tubular lamp mounted in said chamber behind said window, a reflector member also mounted in said chamber and enclosing said lamp, said reiiector member having a longitudinally extending aperture therein between said window and said lamp, current-supply connections for said lamp, inlet and outlet members communicating with said chamber for circulating a cooling liquid therethrough, and a guide member transparent to light rays mounted on said reflector member over the said aperture therein, said guide member being arranged to control the ilow of the cooling liquid in said chamber so that it flows along both sides of said guide member but in opposite directions.

3. A light projection device-comprising a casing provided with a chamber having a window therein, a high intensity tubular lamp mounted in said chamber behind said window and having current-supply conductors, a metallic reflector member also mounted in said chamber adjacent said lamp. one of said current-supply conductors being connected to said reflector member and the other o! said conductors being led through and insulated from one end of said casing, inlet and outlet members at the opposite end of said casing communicating with said chamber for circulating a cooling liquid therethrough, and a guide member mounted in said chamber and arranged to control the ilow of the cooling liquid from said inlet member through said chamber past said lamp and back to said outlet member.

4. A light projection device comprising a casing provided with a chamber having a window therein, a high intensity tubular lamp mounted ln said chamber behind said window, a reector member also mounted in said chamber behind said lamp, current-supply connections at one end to control the ow of the cooling medium from said inlet member through said chamber past said lamp and back to said outlet member, said lamp, reilector member,`guide member and current-supply connections being so constructed and arranged as to form a unitarystructure whereby the same may be removed from and replaced in said casing as a unit.

` HENDRIK nr: JONG.

JAN BERGMANS. WILLEM KORTENRAY. 

